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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3041910a520585c7388b8eae05a0ea9125a1020c7d2781f81db0a5507d7ebd9' 
  AND token = 'dACHP8c33vCs1oEr2cfH1sDOOtcyrCQZxkxNudCwYF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}